Quantcast AIR OPERATED VALVE (FOR AERIAL DISCHARGE) FAILS TO OPEN OR CLOSE

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"HUNTING" (FLUCTUATING PRESSURE)
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TM-5-4210-233-14P-1 Twin Agent 4x4 Firefighting Truck Model No. CM-KFT-B Manual
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DISCHARGE HOSE WON'T DE-PRESSURIZE
TM 5-4210-233-14&P-1 Table 4-2 Unit Troubleshooting - Continued MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION FIREFIGHTING SYSTEM - Continued 11 AIR OPERATED VALVE (FOR AERIAL DISCHARGE) FAILS TO OPEN OR CLOSE Step 1. Check position of battery switch. Rotate battery selector switch to 1, 2 or BOTH. Step 2. Check that air system is pressurized. Start engine to pressurize system. Step 3. Check for air leaking from valve or motor connections. Tighten connections. Step 4. Refer to electrical system troubleshooting. If valve fails to operate, replace or repair air operated valve (para 4-199) or pneumatic actuator (para 4-200). 12 VALVES LEAKING WATER/AGENT Step 1.  Check that valves are closed. Close valve. Step 2. Check for internal valve failure. Refer to Direct support maintenance level. 13 WATER/AGENT REMAINS IN PIPING AFTER DRAIN OPENED Step 1. Check for clogged drain valve outlet. Clean dirt/blockage from drain hole. Step 2. Check for water frozen in piping or drain valve. Apply heat to piping and drain valve. Step 3. Check for defective drain valve or linkage. Refer to Direct support maintenance level. 4-56

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